Radio receiving apparatus



vamh 19, 1929. H. M. HILL 2 1,705,522

RADIO RECEIVING APPARATUS Filed April 2o', 1925 ATTORN EY5.

?etentetl lit/lar., li?, 192%.

.naires stares 'nnnisnnfr 1u. HILL, or LEoiiiA, NW'JERSEY. Y

RADIO niienrvrnci` Arran/artis.

conveniently closed and carried in coat orv vest pociret and inivhich the operating parts shall he entirely protected during such transportation. c

In a preferred specific embodiment of the invention, the set includes a small hook-like folder having stiif covers and a limherjbaclt. A coil of loosely Wound Wire constituting an inductance is secured byv a strap to oneof the covers closely adjacent the liniher hack, and preferably carries a manually f displaceable member in the nature of a movahle ring which limits the spreading ofthe free rportions of the coil convolutions and thereby effects adjustmcntV of the inductance coil with a high degree of precision.v 1

Accordine to another preferred feature, at-

tachment means is provided on the folder for attachment of thecrystaly detector and of the aerial, ground and telephone Wire terminals.

rllhe attachment means preferably comprises a plurality of clips extending adjacent the free edge and one of the side-edges'at the in side of one ofthe stiff covers. Preferably also one' of the clips protrudes beyond the attached edge of the cover and servesas a rein-v forcement for theV limber back. l lhen the folder` is Closed, the covers are spaced apart, a predetermined distance by the clips. Thus the crystal is thoroughly protectedpagainst crushing or loss and there can he no distor-V tion of the loose Wire inductance coil While it is confined between the covers of the folder.

According to another feature, the crystal is mounted by clamping between spring clamping jaws nearoiie end of a metallic clip, the other endV of the clip being provided with `means for gripping a conductor.

According to another tion, the Contact or Cats Whisker is'. mounted in another clip in such a manner that it may be llirmly heldin any desired position 'of adjustment relative to the crystal, The cat-s Whisker is preferablyfformed of a thin length'of pointed-steel from which the temper been drawn andis so mounted iii Vits sup.-

feature Vof the invenfippncatioii iiiea iiprii 20, i925. serai no. 24,497,

porting. clip that it will havel a light yet firm engageineiitwith the crystal. r

- The present application forms a continuation in part of my copeiiding application,

rarest cream.. f

Serial No. 583,525, filedAugust22, 1922, novv l Patent No.v 1,545,754, granted July- 7, 1,925,

in Wliich'the variable inductance is claimedl per se, and also of my copeiiding application, Ser. N o. 666,666 filed'Octolier 5, 1923,totlieclip per se. L

1n the accompanying drawings,

in closed position,

.Figure 2 is a plan View of the device in open l position,

' Figure 3 is a side elevation or edge vieiv showing thefinductance coil in onel position of adjustmenv, l 1

lFigure 4 is a sectionalview on'the staggered line 24H4 of Figure 2'shoiving thecoil in anboard or any other inexpensive material coinprising relatively stiff covers 10 andy 11, and

-a limber or flexible-back 12 connectingthe covers.` Upon the'in'side of this folder, I

Figure 1 is perspective view of thefset mount the variable inductance coil, a] cletector and the various Aterminal members for fr telephone Wires.. j

The variableinductance comprises a loose'- fthe Yconnection of v the antenna, ground and ly Wound coill?) formed'of Ya singlele'ngth of enameled Wire preferably retained in position by strap'14. having itsijlexiloleinterme-k diate portion encircling the coilv andliavingits'end's' hcld'tog'ether and to the cover 1() by. arivet or other lsecuring device 15. The rivet 1 15 is arranged-closely'adjacen'ttheedge of the cover 10 sothat the' coil encircling strap 14 normally extends over theifl-exible backV By thus arrangingthe coil', Il reduce theVv necessary dista-nce between the back and thev cover edges to V,a lminimum for any given V size of coil and tend toward coiiipactness of the set. The strap is yof sulicient size tol snugly hold*pcontiguousportions'of the coil convolutions together While the non-contiguous portions are free'to spread and separate as indicated in Figures 3 and 4, to an extent which is predetermined'by aliiiovablel adjust-V ing strap or ring 16 encirclingftlie'coil. lvStrap 16 is substantially similar' totliestrap14 ex?, cept that its free endsare merely riveted to# as indicated 1in-Figure edge of the table.

gether at 17 and not anchored to a cover. The normal tendency of the coil convolutions is to spread. apart and when the strap 16 is moved to a position diametrically opposite the strap 14, this spread is reduced to a minimum or in other words, is negligible. When however, the strap 16 is moved to a position ,immediatelyjadjacent, the strap 14, thecoil convolutions may freely spread with respect to the strap `14 as an axis. kAny intermediate position oit' the strap 16 will serve to adjust the self-inductance ot the coil so that tuning may be` accomplished with great precision.

-Apparently the inductance is a maximum when the coil ris in its normal'collapsed position and is reduced as the convolutions are spread apart, and is apparently a minimum when the coils are symmetrically disposed with respect to the two covers of the folder The inductance may also be changed by varying the distribution oi" the convolutions; i. e. making them more compact at one region and spacing them further from each other in any other region.

i Obviously i'iurt ier-'variation maybe effected by pressing upon the coils to change their form orshapc. y K

It will benoted that the connected ends ot the strap 16 .afford a convenient handleA Vfor shitting the positionoi this adjusting member. The inductance coil may be spread through even a greater angle than the5180 angle shown in Figure 4 it the folderll is .supported adjacent the edge of a table as by Ya suitable weighted .retaining device and the cover 1G permitted to hang. down below the It is desirable that the strap 14 exert suiicientpressure on the coil `convolutions at their point ot'contiguity vto impart a norinaljspreading tendency to the non-contiguous tree parts' of the convolu-v tions.

- 'The mounting means for-the crystal 18 which vserves the detector is preferably a gripping member, the base 19 of which is f riveted at 20 'tothe kcover 10l of the folder and ext-ends parallel to the shorter edge thereof,

' closely adjacent thereto.` rl`hepreferred clip member shown comprises integral ears 21 Aupstanding from the members 19, the jaw 22 of th c clamp being pivoted at 23 betwcenthe Iears Bland urged by an expansion spring 24 into coaction with aw teeth 25 'formed at the free end oi base 19'. The crystal 18 is thus Iirmly held between the clan'iping jaws by the expansion ot' the s )rinW 24. The other end of the kl es i v base 19 'is preferably a conventional Fahnestockcli p Q5, ot well known construction for gripping the ground terminal.' The curved endof the Fahnestock clip projects over the inner edge of the cover 10a-nd acts as a still" reinforcement about which the limber back is folded as the kcovers aire' swung toward closed position. i j

The base member 19 is shown as an integral piece extending from the jaw 25 and reveisely bent at 26 but itvwill be apparent that the device may be made ot compositeconstruction so as to utilize standard clip elements.

Along the inside of ,the free edge of the Vcover 10 I provide a pair et double endedy lahnestock clips 32, 33 of conventional construction whichextend substantially the entire length of the cover and are spaced from each other.- These clips may be conveniently secured to the coverby rivets 34 or other appropriate .securing devices The two adjacent clip elements 35 Vand 36 preferably holdthe terminals'of the telephone wires (not shown). Clip element- 37 is used for making an aerial connection, Vand clip clement 38 holds the contactl pin or cats Whisker, whichlatterinay be conveniently formed by bending into general l U shape, atinely pointed steel needle from which the temper hasfbe-en drawn. The slierter leg'lQ oit 'the U is held by the clip andthe i lon-gerleg 39a of the needle projects from the.

clip and is bent atright angles adjacent the point. This construction causes the point or" the needle to bear with a slight springpressure against the crystal, and orall ordinary purposes of adjustment, it is not necessary to touch the holding clip, The bent intermediate portion ot' the cats Whisker may be manually depressed to effect elevation ot' the contact peint and swinging the Vsaineover a new point on the crystal with which contact is to be made when pressure on the bent end is re- Y lieved.- Of course, major adjustment ot the Whisker may be made by depressing 'the finger piece oi the clip element 38, manually changing the position of the Whisker and then releasing the lingerpiece to reclamp -it in position. Vhe Fihnestock clips constitute a reinforcement for the covers to prevent flexing thereof, andfact as spacers to limit the relative l approach of the covers and to prevent undue' pressure on the Yreceiving apparatus by the covers when the set is shipped or transported.

In an folded set,vnone otthereceiving appara- Vtus projects beyond an edge of the cover.

lhere is no danger of the coverpressing the stops and there will be n o danger of coildis tortion.

The clip 19 is capable of ge'neialapplicay tioiiindependently of the receiving set.v @ne desirable application'is ineifectingtheconi nection of an ordinary Bbattery. Then used for this purpose, gripping jaws 19, 22 clip the termina-l and the lead Wire from the battery held in the Fahnestoclr clip element 26.

If the jaws 19, 22 are of larger proportions, they might also be used for embracing a grounding metallic pipe while clip elementQG graspeda ground wire from'a set.

The covers maybe conveniently held vin closed position by any suitable means vas for instance, the strap l() connected at one end to -cover l and'carr'ying at its freeend a separable fastener element 41 for coaction with a mating element 42 on the outside of cover ll..

It will thus be seen that the herein described apparatus in which the several features of this invention are embodied, and which ap` paratiis in its action attains the various objects of the invention and is well suitedI to meet the requirementsjof practical use.-

As many changes could be made in the above construction, and many apparently Widely different embodiments oi this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and'not in a limit`v ing sense. y y j y Having thus described my invention, what I claim as new and desire to secure by Letters Patent is a j l. ln a radio receiving set, in combination a folder, a coil of loosely wound wire confined between the covers of the folclor, strap means and contact means for a telephone wire, the

other clip serving for connection with the other telephone wire.

2. In a radio receiving set, in combination a folder, a coil of looselywound wire confined between the covers of the folder, strap means through the coil fixing thel said coil to the foldei' adjacent the back thereof, a metal clipA member secured tothe inside of one of the covers of the folder, adjacent one of the edges thereof and having a pair of jaws for gripping a crystal, a pair of metallic clip members se cured to the side of said folder adjacent an edge thereof, one-of said clips sustaining a` contact member for contact with the crystal,

and contact means for a telephone wire, the.

other clip serving for connection with the other telephone wire, an adjusting strap slidable on the wirecoil and operative when in position diametrically opposite vthe retaining strap 'to reduce the coil to a thickness less than the space between the closed covers whereby the coil Vcannot'bedistorted by the covers.v

3. In a radio receiving set, in combination r a folder, a coil of loosely wound wire confined between the covers of thea folder, strap means tlfirough` the coil fixing the said coil to the folder adjacent thev back thereof, a metal clip member securedto thein'side of one of the covers of the-folder adjacentone of the edges thereof and having a pair of jawsl for gripping crystal, .a pair kof metallic `clip members secured to the sideofsaid folder adjacent an edge thereof, -one of said clips*` sustaining' a contact member for contact with the crystal and Contact means for a telephone wire, the other clip serving for connectionV with the other telephone wire, the Contact` means for thetelephone wire being adapted to spring upwardly when the wire'isremoved therefrom, and project beyond' the plane of the crystal retaining means wherebythe tele-` phone wire contact means limits the, closing movement of the folder to'prevent crushing o fvthecrystal. Y Y 1l. ,in a radio receiving set," in combination :a folder, a coil of loosely wound wire confined between the covers of the folder, strap means through the coil fixing the said coil tol thefolder adjacenttheback thereof,

a metal clip member secured to the inside of one of the covers of the folder adjacent one of the edges thereof andhaving a pair of jaws for gripping acrystal, a pair of metallic clip members secured `to the side of said folderl adj acent' an edge thereof, one of: said clipssustaining a contact member for contact with the crystal and contactmeans for a telephone wire, the other clip serving for connection with the other telephone wire,

the back of the folder being liinber and one of the clip me nbers including a rounded end projecting over the inside edge ofa folder cover to reinforce thelimber back whenthe folder is closed. 1

5. Ina radio receiving set, in combinationV a folder, a coil of loosely wound'wire coii- ,fined between the covers of thefolder, strap means through the coil fixing the said -coil to the folder adjacent the back thereof,` a metal clip member secured to the inside of one ofV the covers of the folder, adjacent one of the edges thereof and having a pair ofA jaws for gripping avcrystal, a pair of-metallic clip members secured to the sideof said folderL adjacent an edge thereof, one of said clips sustaining a contact lmember for contact with the crystal and contact means for a telephone wire, the other clip serving for connection with the other telephone wire, the contact member for the crystal comprising a substantially U shaped length of wire having one? leg heldby its clip and including a pointed endy spring pressed against the` crystal, said. contact member being held at a distance from j.

the foldervback, less than the thickness of the telephone wire clips. 1

iio

iso

6. A radio receiving lset including a pairl olf-relatively stiff covers and a backconnect` in@r them a cli su oited onthe inner'face :s i p Y l v ing theni. a clipsupperted on theinner tace of one ot the covers and a crystal held iii 'the clip, a second double ended clip arranger closely adjacent the Jfree edge of the cover and mounting at one end a catls Whisker, the other end of said double ended clip constituting a stopte limit the closing nioveiiient of the cover and protect the crystal and cats Whisler against crushing, said cats ivhislrer including an approximately U shaped length Y of Wire having its intermediate portion disosed closel 1 adiacent the free edee'oit the v `.I :a

cover. p

`8. A radio receiving set including` a tolder Lhaving stiff covers anda limber back, an in- `ductance coil anchored ,to one oit the covers closely adjacent the inner edge thereof, ad-y justing ineaiis for regulating the spread or the free edges of the convolutions oi said coil, a plurality of terminal clips arranged along the edges or' the inside lof one'oi the covers,V certain ofsaid clips mounting aV and ground leads, certe-inet said clips being adapted 'for connection with a telephone, the last nientionedclips being adapted to' nor- Inally spring open When unconnectedto a telephone, whereby theyv serve to liinit the closing movement of the coverswand prevent the covers l'roin contacting with the other clips and the' inductance coil.. Y

9, In a radio receiving set, a crystaha cats Whisker coacting with Vthe crystal, said Whisker including a length'oi' Wire bent into approximately U shape having a turned over pointed end contacting with the crystal, a spring clip retaining Itliesliorter leg of the U in such position that the pointed end of the Whisker lightly contacts the' crystal and in such position that the intermediate portion oi" 'the U is' free for spring depressionto effect elevation oi said point off the crystal.

1Q. A device of the class described in claini 8 wherein the clip Which rcceivesithe aerial lead extends over the inner edge of the cover to reintorce the liinber baci: When thev device isin oldedposition. i

Signed at Nen7 York city, in the county or" 'New York and State of New Yorlgtliis r18th day 0in' April, A.

` HERBERT M. HILL. 

